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Finding the Fourth Proportional to 105,636.78, 145,778.88 and 57,891.84

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Solution

The fourth proportional to 105,636.78, 145,778.88 and 57,891.84 is: 79,890.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,636.78 : 145,778.88 = 57,891.84 : x
  2. Step 2: Convert to fraction form
    105,636.78/145,778.88 = 57,891.84/x
  3. Step 3: Cross multiply
    105,636.78x = 145,778.88 × 57,891.84
  4. Step 4: Simplify right side
    105,636.78x = 8,439,407,596.34
  5. Step 5: Solve for x
    x = 8,439,407,596.34/105,636.78
  6. Step 6: Final answer
    x = 79,890.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.